An engineer measures the Wi-Fi coverage at a customer site. The RSSI values are recorded as follows: Which two statements does the engineer use to explain these values to the customer? (Choose two)
Correct Answer: A,E
Explanation Understanding Signal Strength The most accurate way to express it is with milliwatts (mW), but you end up with tons of decimal places due to WiFi's super-low transmit power, making it difficult to read. For example, -40 dBm is 0.0001 mW, and the zeros just get more intense the more the signal strength drops. Ultimately, the easiest and most consistent way to express signal strength is with dBm, which stands for decibels relative to a milliwatt. You can convert between mW and dBm using the following formulas: P(dBm) = 10 * log10(P(mW)) For example, a power of 2.5 mW in dBm is: dBm = 10log2.5 = 3.979 dBm is that we're working in negatives. -30 is a higher (stronger) signal than -80. Signal Strength Rating Required for -30 dBm Amazing Max achievable signal strength. The client can only be a few feet from the AP to achieve this. Not typical or desirable in the real world. N/A -67 dBm Very Good Minimum signal strength for applications that require very reliable, timely delivery of data packets. VoIP/VoWiFi, streaming video -70 dBm Okay Minimum signal strength for reliable packet delivery. Email, web -80 dBm Not Good Minimum signal strength for basic connectivity. Packet delivery may be unreliable. N/A -90 dBm Unusable Approaching or drowning in the noise floor. Any functionality is highly unlikely. N/A 3 dB of gain = +3 dB = doubles signal strength (Let's say, the base is P. So 10*log10(P/P)= 0 dB and 10*log10(2P/P) = 10*log10(2) = 3dB -> double signal)3 dB of loss = -3 dB = halves signal strength strength (10*log(1/2) = -3.0103)10 dB of loss = -10 dB = 10 times less signal strength (0.1 mW = -10 dBm, 0.01 mW = -20 dBm, etc.)10 dB of gain = +10 dB = 10 times more signal strength (0.00001 mW = -50 dBm, 0.0001 mW = -40 dBm, etc.)
Question 257
Refer to the exhibit. A GRE tunnel has been created between HO and BR routers. What is the tunnel IP on the HQ router?
Correct Answer: B
Question 258
Drag and drop the characteristics from the left onto the orchestration tools that they describe on the right.
Correct Answer:
Question 259
Which method creates an EEM applet policy that is registered with EEM and runs on demand or manually?
Correct Answer: C
An EEM policy is an entity that defines an event and the actions to be taken when that event occurs. There are two types of EEM policies: an applet or a script. An applet is a simple form of policy that is defined within the CLI configuration. answer 'event manager applet ondemand event register action 1.0 syslog priority critical msg 'This is a message from ondemand' <="" p="" style="box-sizing: border-box;"> There are two ways to manually run an EEM policy. EEM usually schedules and runs policies on the basis of an event specification that is contained within the policy itself. The event none command allows EEM to identify an EEM policy that can be manually triggered. To run the policy, use either the action policy command in applet configuration mode or the event manager run command in privileged EXEC mode. Reference: 3s-book/eem-policy-cli.html
Question 260
Drag and drop the DHCP messages that are exchanged between a client and an AP into the order they are exchanged on the right. There are four messages sent between the DHCP Client and DHCP Server: DHCPDISCOVER, DHCPOFFER, DHCPREQUEST and DHCPACKNOWLEDGEMENT. This process is often abbreviated as DORA (for Discover, Offer, Request, Acknowledgement).
